Carving-machine.



D. B. SALSTROM.

GARVING MACHINE.

APPLICATION FILED APILZB. 1910.

Patented Jan. 2, 1912.

'2 SHEETSSHEET 1 COLUMBIA PLANQGRAPM CO .WASHINGTDN, D. c.

D. B. SALSTRDM. CARVING MACHINE. APPLICATION FILED APR.28, 1910.

1,01 3,6 1 8. v Patented Jan. 2, 1912.

UNITED STATES PATENT OFFICE.

DAVID B. SALSTROM, OF CHICAGO, ILLINOIS, ASSIGNOR F ONE-HALF T0 EMANUELKOPRIWA, OF CHICAGO, ILLINOIS.

CARVING-MACI'IINE.

Specification of Letters Patent.

Patented Jan. 2, 1912.

Application filed April 28, 1910. Serial No. 558,215.

. which the following is a specification.

This invention relates to carving machines, and particularly to thattype of carving machine in which the tool spindles are mounted in a headwhich is supported so that it may be moved up and down, back and forth,and laterally.

It is highly desirable that vibration of the tools be eliminated orreduced to a minimum, since such vibration gives the work a rough orpitted appearance, and it is one of the objects of this invention toprevent vibration of the tools. I have discovered that Vibration of thetools can be substantially eliminated by so supporting the tool-driverthat it has no positive connection with the spindle carrying head. Ahead carrying a suitable number of spindles is quite heavy, and when itbecomes necessary for the operator to move the head some distance outfrom under the points of support of the head considerable exertion isrequired to hold the head in such position.

One of the objects of this invention is to provide means forcounterbalancing the weight of the head when it is so displaced.

' In the accompanying drawings, Figure 1 is a front elevation of acarving machine embodying the features of my invention, thework-supporting table being omitted. Fig. 2 is a horizontal sectionalview taken in the plane of dotted line 2 2 of Fig. 1. Fig. 3 is asectional view illustrating an improved form of spindle bearing. Fig. 4is a section on line 4 4 of Fig. 3.

The spindle-carrying head 1 is supported, in this instance, by meanscomprising a rock shaft 2, which shaft in turn is carried by a beam orother suitable fixed support 3. Rigidly mounted upon the shaft 2 are twolevers 4 carrying counterbalancing weights 5 at their rear ends, andconnected at their front ends to links 6. Each lever 4 is connected toits link 6 by means of a universal joint '7 of any suitable constructionpermitting the link to swing back and forth and from side to side. Thelower ends of the links 6 are connected to the spindle-carrying head 1by means of universal joints 8 able means such as a rock shaft 9 (Fig.2)

of suitable form. It will be seen that the head 1 may be moved up anddown, from side to side, and forwardly and rearwardly.

In order to maintain the head 1 in parallelism with the rock shaft 2, Iprovide suit- 7 mounted in stationary bearings 10, said shaft havingfixed thereto weighted arms 11 and a pair of arms 12. The arms 12 areconnected by means of universal joints 13 with the rear ends of links14, the forward ends of which links are pivoted, as at 15, to the endportions of the head 1. It will be seen that the shaft 9, arms 12, andlinks 14 equalize the movement of the ends of the head 1 so as tomaintain said head in parallelism with the shafts 2 and 9.

Mounted in the head 1 is any suitable or desirable number of spindles 16provided at their lower ends with chucks to receive the carving tools17. At a suitable point upon the head 1, as, for example, near themiddle portion thereof, is mounted a chuck 18 to receive a tracer 19. Inthis instance, the head is provided with eight spindles divided into twogroups of four spindles each. As shown in Fig. 2, the spindles areresiliently connected to said head so that as little vibration aspossible shall be transmitted from the driver to the head or spindles.

In the present embodiment, the driving means comprises a shaft 20supported in a substantially vertical position in a frame 21. The upperend of this frame is pivoted at 22 in a gimbal ring 23, said ring inturn being pivoted upon an axis extending at right angles to the axis ofthe pivots 22 in hangers 24 fixed to a suitable stationary support 25.The pivots for the frame 23 are indicated at 26. The upper end of theframe 21 extends upwardly past the gimbal bearing just described, and tosaid upper end is fixed a suitable counterbalance weight 27. It will beseen that the frame 21 carrying the shaft 20 is free to swing back andforth and from side to side by reason of its gimbal support.

The shaft 20 may be rotated by any suitable means. I have herein shown apulley 28 fixed to the upper end of the shaft 20 and receiving a drivebelt 29. Said belt transmits power to the machine from a countershaft(not shown) or other suitable source.

To the lower end of the shaft 20 is fixed a drum or pulley 30. Upon thespindles 16 are fixed pulleys 31, 32, 33, and 34. The pulleys 31, 32 and34 may be plain band wheels, but the pulley 33 is preferably providedwith top and bottom flanges to retain the drive belt 35 thereon. Thisbelt extends from the drum 30, around the pulley 33, to the pulley 34,thence to the pulley 31, thence to the pulley 32, and thence to the drum30. It will be observed that the drum 30 is not mounted for-verticalmovement, but said drum is of sutlicient length so that the belt 35remains thereon as the head is moved up and down.

The frame 21 is connected to move lat erally and backward and-forwardwith the head 1, the connecting means being of such character as totransmit substantially no vibration from the shaft 20 to the head 1. Inthe construction herein shown, I provide a rod 36 pivoted at 37 to thelinks 14. A spring 38 is connected at one end to the rod 36 by means ofan adjustable strap 39, and at its other end is connected to the lowerpart of the frame 21 by means of the con nection 40. It will be seenthat the spring 38 tends to move the frame 21 in the direction to takeup slack in the belt 35 and thus maintain said belt at proper drivingten-- sion. Special means for taking up slack in the belt is thusrendered unnecessary. The tension of the belt may be adjusted by meansof the adjustable strap 39. The parts 35, 36, 38, 39 and 40 cause theframe 21 to swing backward and forward with the head 1. To cause theframe 21 to follow the head in its lateral movements, I provide aspacing and connecting member 41 which is connected at its ends with,the link 14 and the connector 40. The member 41 has openings 42 thereinthrough which the connector 40 and one of the members of the link 14extend, said opening being large enough to afford the desiredflexibility.

By the arrangement just described, the driver 30 is connected with thehead 1 so as to move therewith, but the connecting devices are flexibleand resilient so as to prevent the transmission of vibration from thedriver to the head. I have avoided a rigid construction, since such aconstruction readily transmits vibration from one part to another.

Referring to Fig. 1: it will be understood that gravity causes the head1 to hang directly below its points of support at the ends of the arms4, and that when the operator moves the head, say, to the right or left,or

front or rear, the weight of the head and parts connected to it tends tocause the head to return to its normal position. To hold the head forsome time in a position other than its normal position requiresconsiderable exertion on the part of the operator. To relieve theoperator of this burden, I provide a counterbalancing means, whichconsists, in this instance, of a frame 43 arranged in a substantiallyupright position and pivoted between its ends at 44 to a gimbal ring 45.Said ring in turn is pivoted at 46 to hangers 47, fixed to the beam 3 orany other suitable support. It will be seen that the frame 43 is free toswing backward and forward and from side to side. The upper end of theframe 43 carries a counterbalance 48 of any suitable construction. Inthe lower part of the frame 42 is mounted a shaft 49 which extendsthrough a bearing 50, said bearing being pivoted at 51 in a gimbal ring52, said ring being pivoted at 53 to the head 1. The shaft 49 isslidable and rotatable in its bearing 50 and said bearing is free torock because of its universal connection with the head 1. When the head1 hangs freely from its points of suspension, the weighted frame 42 issubstantially vertical and is in substantial equilibrium. When theoperator moves the head, say, to the right, the weight 48 is moved tothe left of its pivotal support 46 and counterbalances the head.

In order that the parts 49 and 50 shall slide as freely as possible uponeach other, means is provided for keeping one of them in constantrotation. Herein I have shown the shaft- 49 as rotated by a belt 54extending about a pulley 55 on the shaft 49 and driven from acountershaft (not shown) or other suitable source of power.

Each spindle 16 is mounted so as to run without lateral or longitudinalvibration in its bearings. The lower bearing 56 may be of any suitableform, as, for example, that illustrated in my copending applicationSerial No. 400,510, filed November 4, 1907. The upper bearing 57 ispreferably constructed as shown in Figs. 3 and 4. The upper part of thespindle is rotatably held between two similar members 58 havingattaching flanges 59. Said members are secured to the head 1 by screws60. The members 58 are slotted as at 61 to render them dle, a head 64 isformed on the upper end of said spindle, which head rests upon the upperend of the members 58. The head 64 is held against its seat by a pin 65which is mounted in an opening 66 formed in the upper end of the nut 63,said pin being acted upon by a spring 67. A rod 68 is extended through aplurality of adjacentpins 65, and one or more springs 67 are attached tosaid rod and anchored to the head. The anchoring means may be a screw 69so as to permit of adjusting the tension of the spring. The latter holdsthe spindle head 64 firmly against its seat and thus prevents endwiseplay of the spindle.

Lubricant may be supplied to the bearing 57 by making the pin 65tubular, as shown, and by providing an inlet opening 70 and an outletopening 71. Said outlet is in the lower end of the pin 65 and ispreferably eccentric to the pin so that the rotation of the spindle willdistribute the lubricant. Strips of felt 72 or the like may be placed inthe slots of the members 58 to hold lubricant.

In operation, the operator moves the tracer 19 over the surface of thepattern, thereby causing the tools 17 to out similar surfaces upon thepieces of work located below said tools. The spindle drivers. 30 beingfree from positive connection with the head, a minimum amount ofvibration is transmitted from the shafts 20 to the spindles. As the headis moved to carry the tracer over the pattern, the weight 48 counteractsthe tendency of the head to gravitate into its normal position.

It will be understood that so far as the connection between the head andthe drivers is concerned, the head might be supported in other ways thanthat herein shown.

Various changes may be made in the present embodiment without departingfrom the spirit of the invention.

. I claim as my invention:

1. In a carving machine, a movable supported head, spindles in saidhead, a driver located outside of said head and having drivingconnect-ion with said spindles, and a yielding connection between thedriver and the head to cause the former to follow the head in itsmovements.

2. In a carving machine, a movably sup ported head, spindles in saidhead, a movably supported drive pulley located outside of said head,belt connection between the drive pulley and the spindles, saidconnection causing said pulley to follow the head when the latter movesin one direction, and yielding means for causing said pulley to follow.the head when the latter moves in anbetween the drive pulley and thespindles, said connection causing said pulley to follow the head whenthe latter moves in one direction, and means for causing the pulley tofollow the head when the latter moves in the opposite direction, saidmeans including a spring tending to move the pulley away from the headand taking up slack in said belt connection.

4. In a carving machine, a head supported for lateral and forward andbackward movement, spindles in said head, a movably supported drivepulley, belt connection between the pulley and the spindles, saidconnection causing said pulley to follow the head when the latter movesforwardly,

means including aspring for causing the pulley to follow the head whenthe latter moves rearwardly, and means for causing the pulley to followthe head when the latter moves laterally.

5. In a carving machine, a head supported for forward and backwardmovement, spindles in said head, a drive pulley having belt connectionwith the spindles, said belt connection causing the pulley to follow thehead when the latter moves forwardly, and means for causing the pulleyto follow the head when the latter moves rearwardly, said meansincluding a spring tending to move the pulley away from the spindles andserving to take up slack in the belt connection.

6. In a carving machine, a head supported for forward and backwardmovement, means for equalizing the movement of the ends of said head,said means including a link attached to said head, spindles in saidhead, a driver having a driving connection with the spindles, and meansfor causing the driver to move with the head, said means comprising aspring attached at its forward end to the driver and means forconnectingthe rear end of the spring to the link.

7. I11 a carving machine, a movably-supported head, means for equalizingcertain movements of the head, said means including a link attached tothe head, spindles in the head, a driver having a driving connec tionwith the spindles, and means for causing the driver to move with thehead, said means comprising a spring attached at its forward end to thedriver, means for attaching the rear end of the spring to the link andmeans for connecting the forward part of the spring to and for spacingit from the link.

8. In a carving machine, a movably supported head, a rock shaft, armsfixed on said shaft, links connecting the ends of the head to the arms,two groups of spindles in said head, a driver for each group ofspindles, a driving connection between each driver and its spindles, amember attached to and extending between said links, and tension springsattached to said member and to the drivers, said springs exerting theirtension against said driving connections.

9. In a carving machine, a movably supported head, a rock shaft, armsfixed on said shaft, links connecting the ends of the head to the arms,two groups of spindles in said head, a driver for each group ofspindles, a driving connection between each driver and its spindles, amember attached to and extending between said links, tension springsattached to said member and to the drivers, said springs exerting theirtension against said driving connections, and means extending betweenthe springs and the links and serving to space the drivers from thelinks.

10. In a carving machine, a movably supported head, spindles in saidhead, a spindle driver located rearwardly of and outside of said headand free from positive connection with said head, a driving connectionbetween the spindles and the driver, and yielding means for spacing thedriver from the head and for causing the driver to move with the head.

11. In a carving machine, a spindle-carrying head, means for movablysuspending said head, and means for counterbalancing the head when thelatter is swung out from a point directly beneath the suspending means.

12. In a carving machine, a spindle-can rying head means for suspendingsaid head for vertical, lateral and forward and backward movement, andmeans for counterbal ancing the head when the latter is swung laterally,backward or forward.

13. In a carving machine, a spindle-carrying head, means for movablysuspending said head, and counterbalancing means for the head, saidcounterbalancing means having a sliding connection with the head.

14. In a carving machine, a spindle-carrying head, means for movablysuspending said head, and a pivotally-supported weightcarrying memberconnected to said head for counterbalancing the latter, said memherbeing in equilibrium when the head is hanging freely from its points ofsuspension.

15. In a carving'machine, a spindle-carrying head, means formovably'suspending said head, a member pivotally supported at when thehead is hanging freely from its points of suspension.

16. In a carving machine, a spindle-carrying head, means for movablysuspending said head,.a member pivotally supported at a point bet-weenits ends, a sliding connection between the lower end of said member andthe middle portion of said head, and a Weight carried by the upper endof said member.

17. In a carving machine, a spindle-car- 4 rying head, means for movablysuspending said head, counterbalancing means for said head, membersforming a sliding connection between the head and the counterbalancingmeans, and means for rotating one of said connecting members.

18. In a carving machine, a spindle-can rying head, means for movablysuspending said head, a frame pivotally supported at a point between itsends, a weight carried by the upper end of said frame, a shaft extendinglongitudinally of said frame and in the lower part thereof, a bearing inwhich said shaft is slidably mounted, a universal joint connectionbetween the bearing and the middle portion of the head, and means forrotating said shaft, said frame being in equilibrium when the head ishanging freely from its points of suspension.

19. A spindle having a head thereon, an adjustable bearing for saidspindle adjacent to said head, said bearing supporting said head, andmeans for holding said head against its support.

. 20. In a carving machine, the combination of a movably supported head,spindles in said head, a driver located outside of the head and mountednon-rigidly with respect thereto, whereby the transmission of vibrationfrom said driver to said head will be substantially eliminated, and adriving connection between said driver and said spindles.

DAVID B. SALSTROM.

Witnesses C. PAUL PARKER, GEORGE L. GHINDAHL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

